I thought about numbers as the first char, but that is legal for filenames so far as I know. I am still mulling that over.
I wasn't aware of that Perl::Critic rule (not surprising) but the POD doesn't mention anything about the legal character set, only that a single-quote "'" should not be used even though it is a valid substitute for the double-colon '::' separator.
It helps to remember that the primary goal is to drain the swamp even when you are hip-deep in alligators.
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